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首页> 外文期刊>Experimental Brain Research >A stimulus-dependent dissociation between the cerebral hemispheres under free-viewing conditions.
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A stimulus-dependent dissociation between the cerebral hemispheres under free-viewing conditions.

机译：自由观看条件下大脑半球之间的依赖刺激的解离。

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摘要

Under free-viewing conditions, the leftward stimulus features are frequently overestimated (pseudoneglect). This asymmetry could reflect the operation of: (a) spatial attention mechanisms in the right hemisphere (RH) or, (b) stimulus-specific activation. To test these propositions, we attempted to induce a stimulus-specific dissociation between the hemispheres under free-viewing conditions. In two experiments (n=23, n=22) dextrals carried out two tasks. The 'grayscales' task required luminance judgments between two mirror-reversed luminance gradients. The flicker task required temporal frequency judgments between two mirror-reversed temporal gradients. The grayscales and flicker tasks suited the processing styles of the right and left hemispheres, respectively. For both experiments, a strong leftward bias was observed for the grayscales task, which could be the result of both of the mechanisms outlined above. In Experiment 1, there was a rightward bias for the flicker task-but only for participants with longer reaction times. In Experiment 2, where all responses were delayed, a rightward bias was found for the flicker task for shorter stimuli. The data demonstrate that stimulus-specific dissociations can be induced under free-viewing conditions. However, the fact that the rightward bias was: (a) weaker than the leftward bias and, (b) reduced by increases in length, demonstrates that RH spatial attention mechanisms are also important.
机译：在自由观看条件下，向左刺激特征经常被高估（假牙齿）。这种不对称性可能反映以下操作：（a）右半球（RH）中的空间注意机制，或（b）刺激特异性激活。为了测试这些命题，我们尝试在自由观看条件下诱导半球之间的刺激特异性解离。在两个实验（n = 23，n = 22）中，右旋糖苷执行两项任务。 “灰度”任务需要在两个镜像反转的亮度梯度之间进行亮度判断。闪烁任务需要两个镜像反转的时间梯度之间的时间频率判断。灰度和闪烁任务分别适合于左右半球的处理样式。对于这两个实验，在灰度任务中都观察到了强烈的向左偏差，这可能是上述两种机制的结果。在实验1中，闪烁任务有一个向右偏斜-但仅适用于反应时间较长的参与者。在实验2中，所有响应都被延迟，在闪烁任务中发现了向右偏向，以缩短刺激时间。数据表明，在自由观看条件下可以诱导特定刺激的解离。但是，右偏偏是：（a）比左偏偏弱，并且（b）长度增加而减小，这一事实表明，RH空间注意机制也很重要。

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